question_answer

The number of ethers in the given list which cannot be prepared by Williamsons synthesis is___. \[C{{H}_{3}}OC{{H}_{2}}C{{H}_{3}},{{C}_{6}}{{H}_{5}}OC{{H}_{3}},\] \[{{C}_{6}}{{H}_{5}}OC{{H}_{2}}C{{H}_{3}},{{({{C}_{6}}{{H}_{5}})}_{2}}O,{{(C{{H}_{3}})}_{3}}COC{{H}_{3}}\], \[{{(C{{H}_{3}})}_{3}}COC{{H}_{2}}C{{H}_{3}},{{(C{{H}_{3}})}_{3}}COC{{(C{{H}_{3}})}_{3}},\] \[{{({{C}_{2}}{{H}_{5}})}_{2}}O,{{C}_{6}}{{H}_{5}}C{{H}_{2}}O{{C}_{6}}{{H}_{5}}\]

Answer:

2